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Topic: Need Schematic for Kustom Amp |
Larry Robinson
From:
Peachtree City, Georgia, USA
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Posted 13 Mar 2006 2:06 pm |
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I need a schematic for '60's Kustom amp head, model: C895. Any help appreciated.
Regards,
Larry Robinson |
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Jack Stoner
From:
Kansas City, MO
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Posted 13 Mar 2006 3:26 pm
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| I worked on a Kustom 100 Bass head about a year ago. I found some schematics on the web by doing a google search. I don't remember what the site was except I think there may be something on the Kustom web site, although they don't have a lot on the older equipment. |
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Larry Robinson
From:
Peachtree City, Georgia, USA
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Posted 14 Mar 2006 5:46 am
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Thanks Jack. I found sites with some schematics. The amp I'm working on is 200 watt head, no reverb, and is vintage'60s. There is a loud buzz in it. I replaced the filters and checked the diodes and that's about as far as I can go without a roadmap.
Larry Robinson |
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Jack Stoner
From:
Kansas City, MO
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Posted 14 Mar 2006 3:18 pm
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Could still be a power supply problem (rectifier diodes?).
Most of the old Kustom equiment used basically the same circuitry. If you find a schematic for a 100, it is probably pretty close to the 200. |
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Jennings Ward
From:
Edgewater, Florida, R.I.P.
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Posted 15 Mar 2006 7:24 pm
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LARRY, CHECK THE CECOUPLING CAPS.. ALSO USE YOU O'SOPE AND CHECK FOR NOISY PLATE AND SCREEN RESISTORS.
JENNINGS
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EMMONS D10 10-10 profex 2 deltafex ne1000 pv1000, pv 31 bd eq, +
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Jennings Ward
From:
Edgewater, Florida, R.I.P.
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Posted 15 Mar 2006 7:26 pm
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LARRY, THAT SHOULD SAY DE-COUPLING CAPS.
JW
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EMMONS D10 10-10 profex 2 deltafex ne1000 pv1000, pv 31 bd eq, +
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Jack Stoner
From:
Kansas City, MO
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Posted 16 Mar 2006 3:25 am
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| Jennings, the Kustom amps were all solid state - no tubes. |
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Larry Robinson
From:
Peachtree City, Georgia, USA
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Posted 16 Mar 2006 4:53 am
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Thanks for the input. Someone worked on this amp before I got it and they have de-soldered components (and laminate) on a PCB that drives the output transistors. I believe the problem is in this board. I'll try scoping it. I think the buzzing may be oscillations since the filter caps and diodes in the power supply are ok. I did replace the caps.
Larry |
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